The oversimplified answer is to never eat fast food (even though it can be healthier than restaurant food sometimes), but if you ever do find yourself looking at a fast food menu, Reddit members have got your back. Fast food workers share the least healthy and most unsanitary food choices at their establishments.

Be prepared to be grossed out reading this thread, though. You'll find examples like this to help you avoid eating fish filet sandwiches from Burger King:

When I was a young buck, I worked at Burger King. Here is how the oil rotation went. You had four vats of oil that you cooked fries in. And boy did you cook fries. Tons of them. After about 2 days worth, the oil got too dark for fries. So we switched it over to the ones for chicken. Since it was darker, it was ok. Then that goes on for a week. After a week of massive frying. The oil is black as motor oil. At that point, it's switched to the Fish Filet vat. That's the only thing you cook in that vat.

Other questionable food choices include Steak n Shake's "Wisconsin Butter Burger" (which has a quarter stick of butter on it), McDonald's sweet tea (made with a pound of sugar per gallon), and Tim Horton's muffins (containing more fat than the doughnuts).

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The top of the thread, started by Reddit user 4ScienceandReason, summarizes some handy rules of fast food engagement: avoid unconventional pizza toppings, fast food ice, visiting restaurants just before closing time, and more. Got anything else to add to the list?